I currently have the Polk RC85i speakers as my main and rear surround speakers. I am now trying to but a center channel speaker and was told that for my size room I should get the CS5i (the room is 22x24x19 feet high). Is the CS2 equivalent to the CS5i as they both have 6 1/2" woofers? Or would I be better served buying the CS5i? Also, is the CS2 voice matched for the RC85i's? Thanks.